{
  "annotation_id": "c76d4bb4-418b-4cd7-b097-47bea9974d62",
  "date_created": "2026-03-02T18:01:21.910000Z",
  "date_modified": "2026-03-02T18:01:21.910000Z",
  "file_hash": "fc244383b04f7054c565b4211f5a5a97dcd1f9f1b9bc76be7650678d3a698eb8",
  "private": false,
  "record": {
    "abstract": "We report observation of Bose-Einstein condensation of a trapped, dilute gas\nof atomic hydrogen. The condensate and normal gas are studied by two-photon\nspectroscopy of the 1S-2S transition. Interactions among the atoms produce a\nshift of the resonance frequency proportional to density. The condensate is\nclearly distinguished by its large frequency shift. The peak condensate density\nis 4.8 +/- 1.1 \\times 10^{15} cm^{-3}, corresponding to a condensate population\nof 10^9 atoms. The BEC transition occurs at about T=50 uK and n=1.8 \\times\n10^{14} cm^{-3}.",
    "arxiv_id": "physics/9809017",
    "authors": [
      "Dale G. Fried",
      "Thomas C. Killian",
      "Lorenz Willmann",
      "David Landhuis",
      "Stephen C. Moss",
      "Daniel Kleppner",
      "Thomas J. Greytak"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1103/PhysRevLett.81.3811",
    "title": "Bose-Einstein Condensation of Atomic Hydrogen",
    "url": "https://arxiv.org/abs/physics/9809017"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d0c764e7-5dfc-4859-8b90-66895346212c",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}